Windows 10: MS Phone Link Mirroring not working

Both PC and Phone is already connected in the same network. I have done basic troubleshooting for these. e.g. turn off anti virus, turn off vpn, re-pair the phone into the pc and even restarted the pc. error still persists.

:)

 

Supported phones for Windows 10 Mobile Insider Preview Mobile

Your list confirms my phone is eligible, Lumia 521. The windows Insider App fails after ~ 15 seconds, restores data and gives me error 80073cf9. I trouble shot this and went thru all the steps mentioned on several websites including MS without any luck. Short of a hard reset, this is where I am now. Suggestions appreciated.

 

Your Phone App - Link to Windows not working

Has anyone found the secret to getting the Your Phone - Link to Windows App working correctly?
Looking at the number of posts in other forums saying they have problems there is clearly a major issue with this App. It's a pity because it used to work quite well before recent Windows updates.
Basically my phone (Samsung A515) will connect to Your Phone on my PC and I can see the headers of Notifications on my PC. If I try to read Messages or access Photos or open Desktop Apps it says I need permissions and asks me to click on a link to send a permission request to my phone. It never arrives. I don't see any permission request. Also it doesn't say what permissions are missing nor how to enable them.
The response from MS is always to ensure that your phone and PC Apps are at the latest version (they are). I suspect there is a major bug in this App, yet others seem to suggest that it does work. Hopelessly confused.
Winver: 21H1 19043 1237.

 

Mirroring function

Just to make sure that this issue doesn't only occur on your particular PC, have you tried mirroring a different PC to the same TV? Did the same issue occur?

Have you also tried mirroring on the same PC before? Did it work successfully? If yes, what were the recent changes made before mirroring failed to work?

To make sure that you got the right steps in projecting a wireless display with Miracast, you may check these steps:

• Turn ON the Miracast option if your TV comes with built-in Miracast support.
• Press the Windows + I keys to go to
  Settings.
• Click Devices, then Connected Devices.
• Click on "Add a Device" and wait for the adapter to appear in the list. Click on the receiving adapter.

I'll be waiting for your response.